<p>The Banganapalle Quartzite Formation occurs in the Cuddapah Basin in India and is characterized by a basal diamond-bearing
conglomerate horizon. The diamonds within this placer are generally thought to have been sourced from the erosion of kimberlites
of the Wajrakurur cluster. De Beers' India's exploration efforts have resulted in the discovery of a number of dykes within
the basin, with petrographical and geochemical similarities to lamproites. It is proposed that far-field stresses related
to the Eastern Ghats Mobile Belt (EGMB) provided extensional sites during the time of lamproite emplacement. The dykes have
not been dated. However, zircons recovered from heavy mineral stream samples in the area exhibit a number of age groupings,
including one in the range of 1287–1370 Ma. This age is interpreted as the emplacement age of the dykes in this region. Kimberlitic
indicator minerals (KIMs), recovered from conglomerate waste dumps, indicate the uniqueness of the garnet population relative
to that of the known kimberlite clusters to the west of the basin. We propose that the emplacement of lamproites occurred
as dyke–sill complexes at 1.4–1.3 Ga and that the lamproites represent the source of the diamonds in the Banganapalle conglomerates.
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